Created by Master Student

Biology Practice Test #9

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A genetic mutation results in a DNA sequence that continues to synthesize the same protein, at the same rate as a nonmutated sequence. This mutation would be BEST classified as a

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As a reaction proceeds, reactants form a transition state, which then forms the products. An enzyme affects the energy of the

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In the Oparin-Haldane experiment, the artificial atmosphere they created contained which of the following? I. Hydrogen gas II. Oxygen gas III. Reducing gases

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Which of the following characteristics of an allele is required for it to increase in a population through natural selection?

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Transports amino acids during protein synthesis

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A somatic cell of the common octopus (Octopus vulgaris) has 56 chromosomes. What number of chromosomes will an octopus gamete contain?

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During mitosis, a checkpoint ensures that all chromosomal kinetochore proteins, present at the centromere of each sister chromatid, are attached to spindle fibers. Kinetochore proteins that are unattached produce a signal that prevents mitosis from proceeding to the next stage. This checkpoint occurs at the transition from

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At some point in their development, chordates possess all of the following EXCEPT

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This organ secretes a hormone that causes the liver to break down glycogen.

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A unicellular organism contains a Golgi body and ribosomes but lacks a cell wall. It is heterotrophic, ingesting food via phagocytosis. What kingdom does this organism belong to?

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This nucleic acid carries genetic information to the site of translation.

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Edward's syndrome is the result of an additional 18th chromosome present in a fertilized embryo. Which of the following events could lead to the presence of this additional chromosome in a zygote?

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A population of birds lives in an area with many insects upon which it feeds. The insects live inside trees, burrowing into the bark. Over many hundreds of years, the average beak size in the bird population has increased. This is due to

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Pepsinogen is secreted by the cells lining the stomach. In a low-pH solution, it is converted to an active enzyme, called pepsin. The purpose of producing pepsinogen instead of pepsin is to

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Which of these mutations in a gene will MOST LIKELY result in a shortened protein with a long sequence of substituted amino acids?

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A human hereditary disorder that is present only in males is most likely

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Biome characterized by great diversity of flora and fauna and high levels of precipitation

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Which of these releases carbon dioxide? I. Lactic acid fermentation II. Alcohol fermentation III. Aerobic respiration IV. Photosynthesis

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A barren, rocky community near a lake has virtually no vegetation or animal life. After a period of approximately 75 years, the community boasts a wide variety of flora and fauna, including deciduous trees, deer, and raccoon. Usually the first organisms to colonize rocky areas are lichen. These are known as the

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What is the role of mRNA in protein synthesis?

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Geese recognize a ticking clock as "mother" if exposed to it during a critical period shortly after hatching

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Which of the following indicates that animals have internal biological clocks?

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Semelparous species produce a large number of offspring once in their life spans. Iteroparous species produce a small number of offspring repeatedly throughout their lives. Which ecological condition will most likely select for a semelparous strategy?

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Tissue that conducts sugars downward from the leaves

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Which of these form the basis of natural selection? I. Random mating II. Limited environmental resources III. Stable genotype frequencies over time

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Human immunodeficiency virus (HIV) is a retrovirus that integrates its own DNA into a host cell's genome using

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Which biome contains maples, squirrels, and black bears?

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Which of these does NOT secrete any digestive enzyme?

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The steps of protein synthesis and modification take place in several different locations throughout the cell. What is the proper order of these locations, from start to finish? I. Ribosome II. Nucleus III. Golgi apparatus IV. Endoplasmic reticulum

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Which structure releases hormones that signal the tissue lining the uterus to thicken?

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Which describes the cause of eutrophication in lakes?

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What is the role of mRNA in protein synthesis?

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A researcher has a black guinea pig and wishes to determine if it carries a recessive allele for white hair. Both of the guinea pig's parents are black. Which of the following would be the best method for the researcher to use?

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This is required for speciation to occur.

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In a tropical food web, 800,000 kJ of energy are produced by autotrophic species. Approximately how much energy will exist at the level of secondary consumers?

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How do enzymes help to carry out biochemical reactions?

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Crabs and lobsters are both members of the suborder Pleocyemata. Both possess a tail; however, in the crab, this structure is very small and not used. This structure can be considered an example of all of the following EXCEPT

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The loop of Henle is a structure within the urinary tract responsible for reabsorbing water. Compared to a terrestrial species, how might this structure appear in a freshwater aquatic species?

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An organism produces many offspring each reproductive season, only a few of which survive. The survivorship curve for this organism can BEST be described as

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An organism that demonstrates radial symmetry and an exoskeleton would be classified into which phylum?

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